The table shows the periodical scores on left-right position as given in the Comparative Manifesto Project (Volkens, Andrea, et.al., 2010). The scores range from -100 (left) to +100 (right).

Type: Tentative grouping of political parties and alliances based on information provided in the Comparative Manifesto Project and from party descriptions in Europa World Yearbook, Encyclopædia Britannica and in election reports from the European Journal of Political Research and/or Electoral Studies.

IRL was founded in 2006 when two conservative parties, Pro Patria Union and Res Publica merged. Although the new party lost some strenght the 2007 elections, the party still managed to join the government that year. In the above table, note that the CMP scores for IRL are for the Union of Pro Patria (Isamaa) only (in 2003: the IERSP-Isamaa-ERSP Coalition).

Formed in 1990 by Estonian Democratic Labour Party, Estonian Social Democratic Independence Party, Russian Social Democratic Party in Estonia and Estonian Social Democratic Party in Exile. In 1996, it merged with the Estonian Rural Centre Party and took the name "Moderates" (Mõõdukad, M ). Three years later (1998), the Estonian People Party also merged with the party. In 2004, it decided to take back its original name of SDE. The party is positioned on the left side of the centre-right political spectrum and defends EU and NATO membership as well as a social marked economic policy.

Centre-left agrarian party founded in 1994 under the name of Estonian Country Peoples' Party (EME). The party gained its current name in 1999. In 2000, it merged with the Estonian Country Union (EML) and Estonian Party of Pensioners and Families (EPPE). In the above table, note that the CMP scores in 1999 are for the EME.